Crank stitching-machine.



mi 39mm.

PATNTED JULY 2s, 190s.v J. SGHRGEDER.. l @RANK STITGHING Mmmm.

APPLIGATION FILED AUG. 29J 1905.

3 SHEETS-"SHEET L J. SGHROEDER. @RANK 'STITOHING MAGHNE. APPLICATIONFILED ,AUG4 29, 1906.

PATENTED JULY v28, QOS

SSHEETS-SHBET Z,

No. 894,401. PATENTED JULY 28, 1908.

J. SGHROEDER. GRANK STITGHING MACHINE.

APPLICATION FILED AUG. 29, 1906.

3 SHEETB-SEEET 3.

rien.

JOHANN SOHROEDER, OF BERLIN, GERMANY, ASSIGNOR TO THE FIRM OF BERLINERSTICK- MASOHINEN-FABRIK SCHIRMER BLAU d: OO., OF BERLIN, GERMANY.

CRANK -STITCHINGMACHINE.

no. eeaaoi.

To all whom it may concern.'

Be it known that I, JOHANN Scrrnonnnn, a sub]l ect of the King ofPrussia, German Emperor, and resident of 35a Schwedterstrasse, Berlin,Kingdom of Prussia, German Empire, have invented certain new and usefulImprovements in Crank Stitching-Machines, of which the following is anexact specification.

My invention relates to a stop motion mechanism for sewing machines,more especially, for embroidering machines, which stop motion inachanismpermits the machine to be automatically arrested when having made anumber of stitches as desired, for instance, after a pattern to bestitched by the machine is completed.

In order to make my invention more clear, I refer to the accompanyingdrawings, in which:

Figure l is a fragmentary sectional side elevation of a stitching'machine provided with my improvement. Fig. 2 is a plan elevation. Figs.3 and 4 are details in side-and front-elevation, respectively.

a is the main driving shaft of the machine, which is to be coupled withand disconnected from the driving or belt pulley ai and which operatesin the well-known manner by means of a worm a and a worm-wheel c2, adisk b, the so-called pattern-disk, carried by a vertical shaft c.

g is a hollow shaft which incloses the needle bar and which can berotated by means of the toothed wheels t3, bt. The needle bar itself isoperated in the wellknown manner by the driving shaft a and the hollowshaft q carries the thread-holder (not shown) which lays the thread in acertain manner upon the cloth as to produce the embroidery pattern. Thetooth wheel ha is mounted on the vertical shaft b5 carrying the pinion bmeshing with the rack b2.

r is a link hinged at r to the arm rf and pivotally connected with theconnecting rods s and b', the latter being attached to the rack t. Theconnecting link 1 bears with a pin r3 against the pattern disk b.

The vertical shaft c carries a disk d having according to the presentform of my invention two recesses f. Against the circumference of thedisk d bears the arm g of a threearmed lever pivoted to the machine armr2 at g.

Specification of Letters Patent.

Application filed August 29, 1906.

Patented July 28, 1908.

Serial No. 332,505.

Referring to the Figs. 3 and 4 t' is the throwout slide mounted inguiding grooves of a casting piece 75 made integral with the verticalpart of the machine arm r2. The slide i is secured in its position bythe ledge 752 and is adapted to be moved vertically up and down.

i is a spring pressing with its one end against the projection i2 of theslide i andwith its other end against the projection i3 of the castingpiece 7c. At its upper end the slide i is provided with a nose it, andthe lug c forms an abutment for the nose, when the slide is completelydepressed.

7c is a catch pivotally secured by means of the screw bolt lf3 to theslide i and adapted to support the arm 7L of the three-armed lever. Thethird arm Z of this lever is arranged above the plate m carrying thecloth to be stitched. The driving shaft t is coupled with the hollowshaft a3, carrying the cordpulleys a, by means of a spring controlledslidably mounted drum n provided with a curved groove n and adapted tobe moved longitudinally on the shaft a.

As will be readily understood the sleeve or drum n slides loosely over afeather on the shaft a and is provided with projections at its righthandend in Fig. l engaging in corresponding recesses on the sleeve a3 towhich the driving pulleys aL are fixed. In this way the clutch actionbetween the sliding drum n and the sleeve a3 is obtained.

o is a vibrating lever engaging by means of a pin 02 with the groove n.The vibrating lever is pivoted at o to the machine standard and arrangedabove the slide i.

When the machine is working the arm g bears, as seen in Fig. l, againstthe circum ference of the disk (Z, thereby maintaining the throw-outslide i in its lower position by means of the arm lt and the catch Thethrowout slide i thereby does not hinder the vibrating lever 0 from itsvibrations, imparted to it by the curved groove of the vibrating leveroperating drum n. If however the arm o arrives due to the rotation ofthe disk d at the recess f after, for instance, a pattern is completed,the arm g can enter the recess f and the throw-out slide i is movedupwardly owing to the arrangement of the spring i. In this position theupper end of the slide i is within the oscillatory path of the vibratinglever o which is prevented from vibrating thereby, As now the lever isarrested the vibrating lever operating drum is compelled to follow tothe position occupied by the upper end of the vibrating lever, viz. thedrum is shifted longitudinally to the lefthand side and is therebydisconnected from the sleeve a3 whereby the machine is immediatelystopped. For putting the machine again into operation, the operatorpushes the arm Z with the back of the hand by which the cloth is held.The arm g is thereby disengaged from the recessand at the saine time thethrow-out slide i is moved downwards by means of the arm 7L. The lever ois released and the slidable drum n couples the shaft L with the beltpulleys.

Having thus fully described the nature of my said invention, what Idesire to secure by Letters Patent of the United States is In a sewingmachine, a stop motion device comprising a grooved drum slidably mountedon the main shaft of the machine, a spring for moving said drumlongitudinally of the shaft, a driving member mounted on the main shaft,means whereby the driving member and drum may be coupled and uncoupled,a vibrating lever pivoted to the machine standard, one end of whichengages in the groove in the drum, a spring controlled slide mounted inthe standard adapted to engage one end of the vibrating lever, amultiple armed lever one arm of which bears on the top of the slide, anotched disk operated by the main shaft and adapted to be engaged by anarm of the multiple armed lever, substantially as described.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

JOHANN SCHROEDER. l/Vitnesses:

B. V. CAssEN, LoUrs VANDORE.

